Everything has been downloaded but when I open my PI Explorer to start using PI, it can't connect to my PI AF or PI Server. I have tried providing its IP as well as its Host Name and no matter what I get the same error.

I have ensured that the ports are open and that my PI Server is running. PLEASE HELP!

Are you local or remote to the AF Server? What do the AF Server logs say in the Event Viewer of the AF server itself? Is the AF Application service actually running? I see you have active SRP so if this is urgent for you then I would suggest calling into tech support to get someone to take a look at this right away.